Provided are systems and methods to temporarily alter visual acuity of a subject. The patient information is selected from of at least one of, a patient’s activities, behaviors and habit information, and patient monitoring. Since the locating ribs and the bridge are all integrally formed on the housing, this eliminates the possibility of angular misalignment of the position sensor relative the stator during assembly of the motor. , resulting in a gas-solid stream containing molybdenum trioxide vapor. There is provided a method for producing a silver salt of an organic acid, which can provides low fog, high sensitivity and high concentration of blackening when it is used for photothermographic materials, and is suitable for the production of photothermographic materials having low haze and less image degradation after storage. A typical implementation is that of a dispenser 20 attached to fishing lines 19A and 19B, using swivel-type mechanisms 18A and 18B to prevent fishing line twist, which dispenser includes front and rear finned units 11A and 11B, a main fish scent or chum holding cavity 1, and an access door 8.